From df5022e383e931ae8ad6f41e775c18cfbb2ed80b Mon Sep 17 00:00:00 2001
From: Tobias Boege <taboege@gmail.com>
Date: Mon, 4 Jan 2021 17:16:23 +0100
Subject: [PATCH] gb.ncurses: allow stepping out of and into ncurses mode

[GB.NCURSES]
* NEW: Screen.Suspend and Screen.Resume are two new methods which
  allow to temporarily leave ncurses mode, restoring the original
  tty settings, and to come back, restoring ncurses's tty settings
  and screen content.
---
 gb.ncurses/src/c_screen.c | 21 +++++++++++++++++++++
 gb.ncurses/src/c_screen.h |  1 +
 2 files changed, 22 insertions(+)

diff --git a/gb.ncurses/src/c_screen.c b/gb.ncurses/src/c_screen.c
index eac2df773..7ba90ccdc 100644
--- a/gb.ncurses/src/c_screen.c
+++ b/gb.ncurses/src/c_screen.c
@@ -68,6 +68,8 @@ void SCREEN_refresh()
 {
 	if (!NCURSES_RUNNING)
 		return;
+	if (THIS->suspended)
+		return;
 	update_panels();
 	doupdate();
 }
@@ -99,6 +101,7 @@ static void CSCREEN_echo(CSCREEN *scr, int mode)
 
 BEGIN_METHOD_VOID(Screen_new)
 
+	THIS->suspended = 0;
 	CSCREEN_cursor(THIS, 1);
 	CSCREEN_echo(THIS, 1);
 	INPUT_mode(THIS, INPUT_CBREAK);
@@ -182,6 +185,21 @@ BEGIN_METHOD(Screen_Resize, GB_INTEGER lines; GB_INTEGER cols)
 
 END_METHOD
 
+BEGIN_METHOD_VOID(Screen_Suspend)
+
+	THIS->suspended = 1;
+	def_prog_mode();
+	endwin();
+
+END_METHOD
+
+BEGIN_METHOD_VOID(Screen_Resume)
+
+	THIS->suspended = 0;
+	doupdate();
+
+END_METHOD
+
 GB_DESC CCursorDesc[] = {
 	GB_DECLARE("Cursor", 0),
 	GB_NOT_CREATABLE(),
@@ -259,6 +277,9 @@ GB_DESC CScreenDesc[] = {
 	GB_STATIC_METHOD("Refresh", NULL, Screen_Refresh, NULL),
 	GB_STATIC_METHOD("Resize", NULL, Screen_Resize, "(Lines)i(Cols)i"),
 
+	GB_STATIC_METHOD("Suspend", NULL, Screen_Suspend, NULL),
+	GB_STATIC_METHOD("Resume", NULL, Screen_Resume, NULL),
+
 	GB_STATIC_PROPERTY("Cursor", "i", Screen_Cursor),
 	GB_STATIC_PROPERTY("Echo", "b", Screen_Echo),
 	GB_STATIC_PROPERTY("Input", "i", Screen_Input),
diff --git a/gb.ncurses/src/c_screen.h b/gb.ncurses/src/c_screen.h
index 9767dc383..a3309721b 100644
--- a/gb.ncurses/src/c_screen.h
+++ b/gb.ncurses/src/c_screen.h
@@ -40,6 +40,7 @@ typedef struct {
 	int cursor;
 	int input;
 	int buffered;
+	int suspended;
 } CSCREEN;
 
 int SCREEN_init();